[15.2] Backport-366617-Owners alone can use group protected environments API

What does this MR do and why?

Backport related issue: https://gitlab.com/gitlab-org/release/tasks/-/issues/4213

We are combining both the below MR's here as discussed in https://gitlab.com/gitlab-org/release/tasks/-/issues/4213#note_1075436291:

!92801 (merged)

!94857 (merged)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #366617 (closed)